What is the function of O2 sensor, what will happen if it is not working other than "Service Engine Soon"?

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Answers:

Can I re-align the headlights on my 2003 Hyundai Elantra?

The vehicle's onboard computers read the data from the sensors, and adjust air flow and fuel usage accordingly.

Dodge 2500 Differential?

Your gas milage will probably become very poor, the engine will run rough, more maintenance issues will come up and the engines' life could be shortened.

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another 1993 mercury cougar question?

Your engine will run rich and you will eat gas like no tomorrow if your O2 sensors are bad. Then you will get a clogged catalytic convertor.

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